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ISO/FDIS 18191

Water quality — Determination of pHT in sea water — Method using the indicator dye m-cresol purple

General information

50.20     Mar 30, 2026

ISO

ISO/TC 147/SC 2

International Standard

13.060.50  

Scope

ISO 18191:2015 specifies a spectrophotometric determination of the pHt of sea water on the total hydrogen ion concentration pH scale using the indicator dye m-cresol purple. The total hydrogen ion concentration, [H+]t, is expressed as moles per kilogram of sea water. The method is suitable for assaying oceanic levels of pHt 7,4 to 8,2 for normal sea water of practical salinity ranging from 20 to 40.

Life cycle

PREVIOUSLY

PUBLISHED
ISO 18191:2015

NOW

PROJECT
ISO/FDIS 18191
50.20 Proof sent to secretariat or FDIS ballot initiated: 8 weeks
Mar 30, 2026

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